Method of rolling flanged bars.



H. SACK, DEGD;

A. SACK, ADMINISTRATRIX.

METHOD OF ROLLING FLANGBD BARS.

v APPLICATION FILED JAN.21. 1907. 939,1 68.

Patented Nov. 2, 1909.

' INVENTOR] ArroR/vsy WITNESSES lit UNITED PATENT OFFICE.

HUGO SACK, F DUSSELDORF, GERMANY; ADELHEID SACK ADMINISTRATRIX OF SAID HUGO SACK,

DECEASED.

Specification of Letters Patent.

Patent-ed Nov. 2, 1909.

Application filed January 21, 1907. Serial No. 353,380.

To all whom it may concern:

Be it known that I, HUoo SACK, a citizen of the (lerman Empire, residing at Dussel dorf, Rhenish Prussia, Germany, have invented certain new and useful Improvements in Methods of Rolling Flanged Bars, of which the following is a specification.

The objectof the present invention is to provide an improved method of forming I- bars. by means of which can be constructed I-bars, which, as compared with those at present. in use, shall be more etiicient, especially for bridge bmldmg and similar structures. more convenient in general use,

and tend to greater durability of buildings I in which the bars are laid in concrete.

- In the accompanying drawing, Figure 1 is a view, partly in section and partly in. broken front elevation, of a set of universal rolls for practicing my improved process, in the position they occupy in the final pass;

.Fig. 2 is a similar view of a set of universal finishing rolls; and Figs. 3, 4, and are cross-sectional views of the bar at various stages of its manufacture.

Referring to the drawing, 1 indicates a pair of horizontal rolls, substantially alike in.

form, and 2, 3 indicate a pair of vertical rolls situated in the same plane as the horizontal rolls 1 and co-acting therewith. :In general arrangement and mode of operation, these rolls are similar to the rolls disclosed in my United States Patent, No. 3(35,100, June 21, 1887, but there are important differences. The contour of the pressure surfaces of the vertical rolls, instead of being curved like that of the rolls disclosed in said patent, is that of two straight lines meeting at an angle. These lines, which form the cross section of the surfaces of the vertical rolls, are respectively parallel with the straight lines which form the cross section of the surfaces of the horizontal rolls. The consequence is that a bar is rolled having angular flanges with no taper.

5 indicates a pair of horizontal finishing rolls, and 6 a pair of vertical finishing rolls, cooperating with the rolls 5. By means of these rolls 5 and (3 these angular flanges are straightened, so as to assume the form shown at 7 in Fig. 5.

The vertical roll 2 is formed with. annular grooves 8, the cross-sectional form of such groove being a right-angled rounded corner, and each of the horizontal rolls is formed with a similar annular groove 9. Consequently, each edge of a flange is rolled with one corner rounded and the other cornersharp or with a tin. After each passage through the rolls, the bar is given a turn about its axis through an angle of 180, and is again passed through the rolls, the effect being that those edges of the bar which were rolled with a fin in the prior passage through the rolls, are, in the next passage therethrough, rounded by means of the rounded annular grooves 8 and 9. Thus the bar is caused to assume the form shown in Fig. 8. The last pass through the rolls of Fig. 2 is done without any, or with. very little ap roach of the rolls only. Thus, at the end 0 the rolling down of the bar, a form of the section is obtained, and shown in Fig. I, in which all the edges are rounded. When the bar has been properly reduced, always retaining rounded edges, then, by means of the finishing rolls, the'flanges are straightened out into the form shown in Fig. 5. Since the flanges have already been made with rectangular edges in the rolls of Fig. 1, it is not necessary that the bar should receive any pressure on the edges of the flanges in passing through the finishing rolls. Therefore the bar can pass through the finishing rolls with the edges of the flanges out i of contact withthe horizontal rolls, as clearly shown in Fig. 2. It is therefore possible to finish in these rolls I-bars having various widths of flanges.

In an I-bar, the flange is generally one and one-half times as thick as the web. In order to uniformly stretch the metal, the horizon tal and vertical rolls must be adjusted in such a manner that this ratio remains unchangedat each passage. By fitting both the initial rolls and the finishing rolls with suitable adjusting gear, the process of rolling may be terminated when a greater or less thickness of the rolled-down bar (as shown in Fig. 4:) has been attained, and the finishing rolls may be adjusted accordingly. From this it follows that if, for some reason or other, a bar is no longer sufficiently hot, and cannot be reduced to less thickness, the result will be a bar, the thicknesses of Whose flange and web will have the same ratio, that is 3 to 2, but while the inside height of the bar remains the same, its outside height is increased by the greater thickness of the flanges, and in the same way, the width of the flanges is increased by the greater thickness of the web.

a The present method makes it possible to produce I-beams with taperless flanges, a result which is not possible with simple grooved, rolls, or by the use of any single mill. A blank is first rolled into a bar having a web, shaped by the cylindrical parallelsurfaces of the horizontal rolls 1, and pairs of marginal, oppositely disposed flanges, shaped by the parallel adjacent faces of the horizontal and vertical rolls 1, 2, 3, these flanges being substantially taperless, or not converging toward their edges, and lying in different planes. The initial bar is then rolled into the finished I-beam having taperless flanges lying in the same plane, by siniul taneously forcing supports, the horizontal rolls 5 of the finishing mill, against its web, and applying pressure to the outer sides of the flanges in lines substantially parallel to the web, by means of the vertical finishing rolls 6.

The adjective non-tapering, as used in claim 1, means flanges which do not taper from the web to their edges, but which are as thick at ornear their edges as at points intermediate their edges and the web.

I claim 1. The method of making I-beams, which consists in first rolling a blank into a bar having a web with pairs, of marginal, oppositely-disposed, non-tapering flanges lying in different planes, and then rolling said bar into an I-beam havingpairs of non-tapering flanges lying in the same plane, by simultaneously forcing supports against said web and applying pressure to the outer sides of the flanges in lines substantially parallel to said web.

2. The method of making I-beams, which consists in first rolling a blank into a bar having a web with pairs of marginal, o'ppositely-disposed flanges of substantially uniform thickness lying in diflerent planes, and then rolling said bar into an I-beam having pairs of flanges of substantially uniform thickness lying in the same plane by simultaneously forcing supports against said web and applying pressure to the outer sides of the flanges in lines substantially parallel to said web. 7

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

HUGO SACK Witnesses M. ENGELS, ALFRED POHLMEYER. 

